The busiest trunk line in the Reykjavík capital transit network, connecting Hlemmur, Hamraborg in Kópavogur, and Hafnarfjörður.
Long-distance countryside route that connects the capital Reykjavík with South Coast hubs Selfoss, Hvolsvöllur, and Vík, extending to Höfn in summer.
The key public transit route connecting Keflavík International Airport with Reykjanesbær, Hafnarfjörður, and the BSÍ Bus Terminal in Reykjavík.